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DPF 2/4...

Duplex FiltersDPF 2/4...

4-Cavity Duplexer for the 160 MHz Band

Description

  • The DPF 2/4… is a 4-cavity duplex filter for duplex radiotelephones.
  • This duplexer is delivered in a low band version type DPF 2/4 L, tunable within 138 - 156 MHz and a high band version type DPF 2/4 H, tunable within 152 - 175 MHz. These models are again delivered in 3 submodels, each dedicated to work with a certain duplex spacing. See “Ordering information” below.
  • The DPF 2/4… models are primarily intended for equipment, where the Tx and Rx operate on single frequencies, but they can also, however with slightly reduced data, be used where the Tx and Rx operate on several channels, i.e. within a certain port bandwidth. In the last case, factory-tuning is recommended.
  • The filter has very small physical dimensions owing to the use of high-Q, temperature compensated helical resonators.
  • The housing is made of extruded aluminium, the chassis of passivated steel, and teflon insulation has been applied in the rigid coaxial cables and in the connectors.
  • The filter is coated with black vinyl to prevent corrosion.

Specifications

Electrical
Model DPF 2/4...
Frequency DPF 2/4 L : 138 - 156 MHz
DPF 2/4 H : 152 - 175 MHz
Max. Input Power 50 W
Special spec. info Single-channel tuned : Multi-channel tuned :
Insertion Loss Tx-Ant and Ant-Rx (at 4.5 MHz duplex spacing)
< 1.0 dB (typ. 0.8 dB)		 1.5 MHz BW : < 1.2 dB (typ. 1.0 dB)
Tx Noise Suppression on Rx Frequency > 60 dB 1.5 MHz BW : > 40 dB
Isolation Rx on Frequency Tx > 60 dB 1 MHz BW : > 40 dB
Impedance 50 Ω
Duplex Spacing 4 - 10 MHz (see ordering)
VSWR < 1.5:1
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f), UHF(f) or SMA(f) on request)
Dimensions 196 (excl. conn.) x 104 x 33 mm /
7.72 (excl. conn.) x 4.09 x 1.30 in.
Weight Approx. 0.67 kg / 1.48 lb.
Environmental
Operating temperature range -30 °C to +60 °C
Frequency Stability Approx. 5 ppm / °C

Diagram and Mounting

TYPICAL RESPONSE CURVE

Ordering Designations

Model Product No. Description Frequency
DPF 2/4 L-4/6-N(f) 200000066 SPACING: 4 - 6 MHz 138 - 156 MHz
DPF 2/4 L-6/8-N(f) 200002661 SPACING: 6 - 8 MHz 138 - 156 MHz
DPF 2/4 L-8/10-N(f) 200000071 SPACING: 8 - 10 MHz 138 - 156 MHz
DPF 2/4 H-4/6-N(f) 200000057 SPACING: 4 - 6 MHz 152 - 175 MHz
DPF 2/4 H-6/8-N(f) 200002662 SPACING: 6 - 8 MHz 152 - 175 MHz
DPF 2/4 H-8/10-N(f) 200000064 SPACING: 8 - 10 MHz 152 - 175 MHz

Ordering Information

When ordering, please use the table above to select the appropriate ordering designation for the desired filter type. If duplex Tx and Rx frequencies are stated when ordering, the duplexers are delivered factory adjusted. If Tx and Rx frequencies are not stated, the filters are delivered nonadjusted.

Please Note

Special configurations of this filter type may be quoted on request. For instance, the filter can be delivered with other connector types or with flying leads (RG 316 coaxial cable) terminated with connectors or for soldering-connection.

Mounting Details

DPF 2!4 holeplacing

All dimensions are given in mm [in.]

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